Replacing mapStateToProps with the useSelector Hook

InstructorJamund Ferguson

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Redux provides a useSelector hook for easy access to state within a function component. This hook replaces the mapStateToProps function which was used previously with connect(). The hooks API is a lot simpler and can be combined nicely with selector functions.

The basic API looks like this:

const value = useSelector(state => state.reducerName.value)

When used with a selector function it looks like this:

const value = useSelector(getValue)
Matt
~ 3 years ago

This seems like it would complicate testing a component vs the older pattern of a separate mapStateToProps(). When you remove props from a component and rely on global hooks, you have more work to do when mocking those usages.